It's Daam K'Vosh/Daam-K'Vosh. http://www.7crows.com/files/Freelancer%20Nomad%20Faction.pdf
RE: Daam K'Vosh: Just because you saw that spelling on a development doc from pre-release doesn't mean they didn't change the spelling after-the-fact. I'm pretty damn sure in-game text somewhere refers to them as Dom'Kavash. I half-wonder if there's a desire to make the name reminiscient of something from Babylon 5 with that K'Vosh spelling.